CVE-2021-3523: Red Hat Apicast

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A flaw was found in 3Scale APICast in versions prior to 2.11.0, where it incorrectly identified connections for reuse. This flaw allows an attacker to bypass security restrictions for an API request when hosting multiple APIs on the same IP address.

Affected products

• Red Hat Apicast: before 2.11.0 (fixed in 2.11.0)

Published 2022-04-27. Last modified 2026-06-17.